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Throughout this tutorial, we’ll be using Angular 6 to build a Progressive Web Application, step by step, implementing the core tenets of PWAs using Angular CLI v6. Next, we’ll use the “Audits” panel (Lighthouse) from Chrome DevTools to analyze our web application against the core tenets of PWAs. Our application has 7 failed audits mainly related to Service Workers, Progressive Enhancement, HTTPS and Web App Manifest which are the core aspects of a PWA. One simple example of PE is the use of the HTML tag that informs users of the need to enable JavaScript to run the application in case It’s not enabled:

The fourth failed audit (“Does not redirect HTTP traffic to HTTPS”) is related to HTTPS which is also a core aspect of PWAs (service workers can be only served from secure origins, except for localhost). The three failed audits (“User will not be prompted to Install the Web App”, “Is not configured for a custom Splash Screen” and “Address bar does not match brand colors”) are related to a missing Web App Manifest which is a file in JSON format that provides the name, description, icons and other information required by a PWA. Continue reading

The Cross Site Scripting (XSS) attack is a type of injection and attackers inject your web applications using the client side scripts and malicious code into web pages. The Cross Site Scripting (XSS) attack is a type of injection and attackers inject your web applications using the client side scripts and malicious code into web pages. An attacker can insert vulnerability scripts and malicious code in your web applications. When a value is Inserted Vulnerability into the DOM from –

Angular recognizes the value as unsafe and automatically sanitizes and removes the

The DomSanitizationService takes care of removing the dangerous bits in order to prevent XSS attacks. When attackers successfully exploit XSS vulnerabilities in a web application, they can insert scripts and malicious code. Continue reading

Understanding change detectionHere is the list of 5 in-depth articles that will significantly expand the boundaries of what you know about change detection process in Angular. Angular’s $digest is reborn in the newer version of AngularThis article draws a comparison between $digest process in AngularJS and change detection process in Angular. Everything you need to know about change detection in AngularThis article is a must-read if you want to have a solid grasp of the change detection mechanism. The mechanics of DOM updates in AngularThis article es deep into implementation details of the process of synchronizing application models with the DOM, a.k.a. one-way data binding or DOM rendering. The mechanics of property bindings update in AngularSimilarly to the previous article on DOM updates, this one explores implementation details of the process responsible for updating input bindings for child components and directives. Continue reading

Imagine that you have a component with a nested structure. To demonstrate this, let’s assume we have the following structure:Let’s say the widget-item element needs to add a specific class to the closest parent, which matches the widget-content class selector when a specific condition is true. First, we need to create a directive whose selector will match the required parent element. Here, we are using the HostBinding decorator to add the overflow class to our host component. Specifies that an injector should retrieve a dependency from any injector until reaching the host element of the current component.and call the addOverflow() method when necessary. Continue reading

Now if speech recognition is not supported, the user will see the Keyboard component and can still enter words manually with the form. The app should look like this in a browser that doesn't support speech recognition:

Now that we can speak and type words to generate a madlib, there's one more method we want to offer to users to create their custom story: automatic word generation using a prebuilt Node API. We can now subscribe to the observable in components and receive an object that looks like this:

This is exactly what we want from the API when generating words, and it's easy to accomplish, thanks to RxJS. It will then emit an event containing the API data so that other components (such as the Words Form component) can use that data. We'll also need to add a little bit of functionality to these components so they can listen for the event and react to it by updating their local property data with the words from the API. Continue reading

You can view the source for the Angular health app, along with instructions to step through the build iterations, in this GitHub repository. After years of building business apps with Angular I find it helps facilitate some incredible scenarios, like this total rewrite of a Silverlight audit tool I did for a local physicians’ group:

Both Angular and JavaScript have been moving at a fast pace and to keep up with the changes I created two new projects based on the original example app. To see an example of that in action, check out the Angular ES6 Health App. If you want to see what the same app looks like using TypeScript and the next version of Angular (that as of this blog post is in beta), take a look at the Angular 2.0 Health App. This is the same app migrated to use Angular 2.0 beta, TypeScript, and AMD for dynamic module loading. Continue reading

Also, we want to make sure, that the color-picker component is exported, so it can be used outside of the module:

Finally, we import the color-picker module into the app module

and use the color-picker component in the apps' template:

The first thing we are going to create is the vertical slider on the right side of the picker. This method is reading the the color at the selected position and is emitting it using the components color-emitter;

As you can see, this method is using another method called getColorAtPosition. This method is using the canvas context to read out the color at the given position. Based on this hue, the gradients in the draw method have a different color. Also, there are some wrappers…

Of course, we also need to provide the two properties "hue" and "color" in our component class:

Hue is the result of the color-slider, whereas color is the result of the color-palette. Continue reading

And if you are using the package manager(npm) you can download through a command in terminal:

Now let’s first create our to-do list demo form for taking value from the user. As it is a template for our to-do app that makes us think where to perform the logical part so let us see further. As above we create a file named , so let’s create our app by giving any specific name for the angular application and its controller

Now let’s begin with the functioning part in which that it can create a list and also it can delete a marked data from the list. , And the function will put some actions in the form of adding and removing data from our to-do list. After completing the functionality of the app, now we will bind the functions of the app in our to-do form. Continue reading

Reactive Forms UsageTo use it with Reactive Forms, we need to set the updateOn option to blur or submit when we instantiate a new FormControl ( the default option is change )this.email = new FormControl(null, { updateOn: 'blur' });Or with validators:this.email = new FormControl(null, { validators: Validators.required, updateOn: 'blur'});When working with FormGroup or FormArray we can use it to set the default updateOn values for all the form's child controls. For example:this.login = new FormGroup({ email: new FormControl(), password: new FormControl()}, { updateOn: 'submit' });onUpdate submit exampleIn the above example, both the controls will be updated on submit unless one of the children explicitly specified a different updateOn value. For example:this.login = new FormGroup({ email: new FormControl(null, { validators: Validators.required, updateOn: 'blur' }), password: new FormControl(null, [Validators.required])}, {updateOn: 'submit'})Forms Module UsageTo use it with the Forms Module, we need to set the updateOn option to blur or submit in ngModelOptions. For example:input type="email" ngModel [ngModelOptions]="{updateOn: 'submit'}"We can also use it to set the default updateOn values for all the form's childcontrols. For example:form [ngFormOptions]="{updateOn: 'submit'}" input name="email" ngModel type="email" input name="password" ngModel type="email"/formIn the above example, both the controls will be updated on submit unless one of the children explicitly set its own updateOn value in ngModelOption. Continue reading

Angular Universal is a core Angular project for enabling the use of Angular 2 on a Node.js server for the purposes of server side rendering. To see this in action, this is a simplified version of what an express server rendering Angular 2 components looks like:

Whats going here is the following:

There is another important element going on, the Angular router is also active on the server side. The way that the Angular 2 router works on the server is that if the user gets sent a direct link to some route inside the application, for example the server side version of the router will then take the route path and use it to determine which component should be rendered. Server side rendering has become popular for example in the React community, as it allows product organizations to build single page applications that do not suffer from search engine indexability issues, and give the user a much enhanced user experience. Its not only about solving SEO issues for single page apps, using Angular on the server allows an enhanced user experience and to have the same app work in a wider range of devices. Continue reading

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